Damien Le Moal <dlemoal@xxxxxxxxxx> writes: > Your PMP is looking like type (1). Correct, which is why the performance isn't good when I try to access both disks at the same time. >> When I enable runtime pm on the drives and the top level port, then try >> to access the sleeping drive, I see this: > > How can you enable runtime PM on a port ? That does not work... It works on *something*, I'm not not sure whether it is or is not the port. /sys/devices/pciblahblah/ata2/power/control can be enabled, and then the port will be runtime suspended. I'm not not sure what that is compared to /sys/devices/pciblahblah/ata2/ata_port/ata2/power/control, which can't be set to auto, and is also /sys/class/ata_port/ata2. I'm not sure why there are two different things that look like an "ata port". > They are the first 2 devices connected to the PMP port that exist. These > correspond to your sdd and sde scsi disks. Right, but the PMP itself is not suspended. I think that causes an attempt to access the PMP while the root port that connects to the PMP is suspended, so that access obviously fails. > Are you running the latest code from Linus tree ? There is now a check on the > power state of a device to avoid useless activate. I hadn't pulled in some time. Updating now.
